We learned today that those infuriating robo calls have reached a whole new level tonight. 200,000 official complaints every month. And not only the number of calls but the way they hound people for money. So how does anyone fight back? Abc's jim avila gets on the line. This is the last time we'll contact you. Reporter: They pretend to be concerned about your car. We have critical information about your automobile warranty. Reporter: To know your credit card balance. This is rachel at card services calling. Reporter: And desperately want you to respond. Please press the number one on your phone now to speak to a live operator. Reporter: But don't do it. Out advice is straight forward, hang up. There are virtually no legitimate marketers trying to reach you to sell you something using a prerecorded ca Reporter: It could shall the number one nuisance in the american home. Robo-calls, those prerecorded sales pitches, they're all illegal whether you're on the go not call list or not. 15 robo-call rings busted last year, but according to a federal trade commission report issued today, it's a violation that keeps on growing. Nearly 4 million people filed officiederal complaints about telemarketing last year. That's up by a million. Why the jump? Easy access technology. A few clicks. Reporter: Entire websites designed to set up do-it-yourself robo-call blasts. 4 cents a call, millions if i want. Create the recording. Push another button. So with three clicks I can be robo-calling. Please consider this your final notice. Reporter: This is just one of the many calls shirley in indiana gets daily. I would get four of five of them a day. Reporter: She hung up and complained to the ftc, who is suing the roco-caller who promised to lower her credit card interest rate if like nearly all these robo-callers want, he could just get her credit card number. They tell me how they are going to charge 990 some dollars to my credit card. Reporter: So it's not just an annoying phone call at dinnertime. These are illegal telemarketing pitches and our goal is to stop them. Reporter: Two crime s in one, the growing roco-call itself and the fraudulent pitch that follows. And the only defense isn't technical at all. Hang up. Jim avila, abc news, new york.

This transcript has been automatically generated and may not be 100% accurate.

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